import java.applet.*;
import java.awt.*;
import java.util.*;
import java.net.*;
import netscape.javascript.*;

public class GizmoButton extends Applet {

	private static Hashtable buttons = new Hashtable();
	private Image on, off;
	private boolean locking, alternating, isPressed = false;
	private URL url;
	private String name, target, function, interlocking;
	private Graphics graphics;
	private AudioClip clickOn, clickOff;

	public void init() {

		if (getParameter("name") != null) {
			name = getParameter("name");
			buttons.put(name, this);
		};
		graphics = getGraphics();

		if (getParameter("on") != null && getParameter("off") != null) {
			MediaTracker tracker = new MediaTracker(this);
			on = getImage(getDocumentBase(), getParameter("on"));
			tracker.addImage(on, 0);
			off = getImage(getDocumentBase(), getParameter("off"));
			tracker.addImage(off, 1);
			try {
				tracker.waitForAll();
			} catch(Exception e) {

			};
			if (tracker.isErrorAny()) {
				on = makeButton(false);
				off = makeButton(true);
			};
		} else {
			on = makeButton(false);
			off = makeButton(true);
		};

		if (getParameter("click_on") != null) {
			try {
				clickOn = getAudioClip(new URL(getDocumentBase(), getParameter("click_on")));
				if (clickOn != null) {
					clickOn.play();
					clickOn.stop();
				};
			} catch (MalformedURLException e) {

			};
		};

		if (getParameter("click_off") != null) {
			try {
				clickOff = getAudioClip(new URL(getDocumentBase(), getParameter("click_off")));
				if (clickOff != null) {
					clickOff.play();
					clickOff.stop();
				};
			} catch (MalformedURLException e) {

			};
		};

		locking = false;
		if (getParameter("locking") != null) {
			if (getParameter("locking").equals("true")) {
				locking = true;
			};
		};

		interlocking = null;
		if (getParameter("interlocking") != null && name != null) {
			interlocking = getParameter("interlocking");
		};

		alternating = false;
		if (getParameter("alternating") != null) {
			if (getParameter("alternating").equals("true")) {
				alternating = true;
				locking = true;
			};
		};

		try {
			url = new URL(getParameter("url"));
		} catch(MalformedURLException e) {
			url = null;
		};

		if (getParameter("function") != null) {
			function = getParameter("function");
		};

		target = getParameter("target");
		if (target == null) {
			target = "_top";
		};
	};

	public void start() {
		System.out.println("GizmoButton Applet\nCopyright 2000 William Johns.");
	};

	public void update(Graphics g) {
		paint(g);
	};

	public void paint(Graphics g) {
		if (isPressed) {
			g.drawImage(on, 0, 0, this);
		} else {
			g.drawImage(off, 0, 0, this);
		};
	};

	public void buttonUp(String set) {
		if (interlocking != null) {
			if (interlocking.equals(set)) {
				isPressed = false;
				paint(graphics);
			};
		};
	};

	public void buttonUp() {
		isPressed = false;
		paint(graphics);
	};

	public boolean state() {
		if (isPressed) {
			return true;
		} else {
			return false;
		};
	};

	private Image makeButton(boolean raised) {
		Image image = createImage(size().width, size().height);
		Graphics g = image.getGraphics();
		g.setColor(Color.lightGray);
		g.fill3DRect(0, 0, size().width, size().height, raised);
		String text = getParameter("text");
		if (text != null) {
			FontMetrics f = g.getFontMetrics();
			for (int i = image.getHeight(this); i > 4; i--) {
				g.setFont(new Font("Helvetica", Font.PLAIN, i));
				f = g.getFontMetrics();
				if (f.stringWidth(text) < image.getWidth(this) * 0.8) {
					break;
				};
			};
			int x = (image.getWidth(this) - f.stringWidth(text)) / 2;
			int y = (image.getHeight(this) / 2) + f.getDescent() + 1;
			if (raised) {
				x++;
				y++;
			};
			g.setColor(Color.black);
			g.drawString(text, x, y);
		};
		return image;
	};

	public boolean mouseDown(Event e, int x, int y) {

		if (isPressed) {
			if (alternating) {
				isPressed = false;
				paint(graphics);
				if (clickOff != null) {
					clickOff.play();
				};
			};
			return true;
		};
		isPressed = true;
		paint(graphics);
		if (clickOn != null) {
			clickOn.play();
		};
		if (interlocking != null) {
			GizmoButton b;
			for (Enumeration eb = buttons.elements() ;eb.hasMoreElements() ;) {
				try {
					b = (GizmoButton) eb.nextElement();
				} catch (NoSuchElementException ex) {
					break;
				};
				if (b != this) {
					b.buttonUp(interlocking);
				};
			};
		};
		if (url != null) {
			getAppletContext().showDocument(url, target);
		};
		if (function != null) {
			try {
				JSObject.getWindow(this).eval(function);
			} catch (Exception ex) {

			};
		};
		return true;
	};

	public boolean mouseUp(Event e, int x, int y) {
		if (!locking) {
			isPressed = false;
			paint(graphics);
		};
		return true;
	};

	public String getAppletInfo() {
		String info= "GizmoButton Applet Copyright 2000 William Johns";
		return info;
	};
};

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